157830138 has 12 divisors (see below), whose sum is σ = 341965338. Its totient is φ = 52610040.

The previous prime is 157830109. The next prime is 157830143. The reversal of 157830138 is 831038751.

It can be written as a sum of positive squares in only one way, i.e., 116575209 + 41254929 = 10797^2 + 6423^2 .

It is a super-2 number, since 2×157830138² = 49820704922198088, which contains 22 as substring.

It is a Curzon number.

It is a nialpdrome in base 15.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4384153 + ... + 4384188.

Almost surely, 2^157830138 is an apocalyptic number.

157830138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

157830138 is an abundant number, since it is smaller than the sum of its proper divisors (184135200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

157830138 is a wasteful number, since it uses less digits than its factorization.

157830138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8768349 (or 8768346 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 157830138 is about 12563.0465254253. The cubic root of 157830138 is about 540.4182151150.

Adding to 157830138 its reverse (831038751), we get a palindrome (988868889).

The spelling of 157830138 in words is "one hundred fifty-seven million, eight hundred thirty thousand, one hundred thirty-eight".